# Quantum Mechanics and Electron Configurations - DOC

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```					Quantum Mechanics and Electron Configurations
Choose words from the list to fill in the blanks in the paragraphs.

Word List
classical mechanics     orbitals
de Broglie              principal quantum number
electron configuration probability
energy level            quantum mechanics
ground state            spectrum
Heisenberg              uncertainty principle                      1.___________________________
Newton                  valence shell
2.___________________________
The term       (1) refers to the laws of motion that were
worked out by the 17th-century English scientist     (2) .         3.___________________________
A mathematical description of the behavior of electrons
inside the atom, developed during the 1920s, is called (3)
4.___________________________
This theory of electron behavior was based in part on the
theory, proposed by (4) that particles can have wavelike
5.___________________________
properties. Then, in 1927, (5) . proposed, in his (6) , that
it ii impossible to know simultaneously both the precise
location and the precise velocity of an electron. One can          6.___________________________
state only the (7) or chance of finding an electron at a
particular place at a particular time.                             7.___________________________

Letters and numbers are used to identify the energy level       8.___________________________
of an electron in an atom. The symbol n stands for the (8)
Each energy level represented by n has sublevels indicated         9.___________________________
by the Letters, s, p, d, and f. Each such sublevel contains one
or more (9) , which are regions of space in which an
10.__________________________
electron of a certain energy may be found.

The lowest energy state of an atom is called its (10) . The    11.__________________________

outermost principal energy level is called the (11) .Atoms
are said to be in a(n) (12) when one or more electrons are         12.__________________________
in a(n) (13) higher than the ground state. When an electron
in an excited atom falls to a lower energy level, (14) is          13.__________________________
emitted whose energy is equal to the energy difference
between the higher and lower energy levels. When the               14.__________________________
radiation emitted is visible, a line of color will appear in the
(15) of the element. The arrangement of the electrons in       15.__________________________
the various levels and sublevels of an atom may be written
out in the form of a(n) (16) .                                     16.__________________________

```
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